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Balance Sheet Details - Accrued expenses (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 24, 2015
Apr. 25, 2014
Payables And Accruals [Abstract]    
Accrued compensation and benefits $ 358.8us-gaap_EmployeeRelatedLiabilitiesCurrent $ 407.8us-gaap_EmployeeRelatedLiabilitiesCurrent
Product warranty liability 57.8us-gaap_ProductWarrantyAccrualClassifiedCurrent 73.0us-gaap_ProductWarrantyAccrualClassifiedCurrent
Other current liabilities 284.8us-gaap_OtherAccruedLiabilitiesCurrent 313.0us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses $ 701.4us-gaap_AccruedLiabilitiesCurrent $ 793.8us-gaap_AccruedLiabilitiesCurrent